Projector

Abstract

A projector includes a light separator configured to separate light emitted from a first light source device into first light with a first wavelength and second light with a second wavelength, a light combiner configured to combine light emitted from a first light modulator and light emitted from a second light modulator, a second light source device configured to emit invisible light, and an optical part configured to combine the first light emitted from the light separator and the invisible light emitted from the second light source device with each other. The invisible light includes first polarized light with a first polarization direction and second polarized light with a second polarization direction. The first light and the invisible light which are emitted from the optical part enter the first light modulator. A projection optical system projects light including the first light, the second light, and the invisible light.

What is claimed is: 
     
         1 . A projector comprising:
 a first light source device configured to emit light including first light with a first wavelength and second light with a second wavelength different from the first wavelength;   a light separator configured to separate the light emitted from the first light source device into the first light and the second light;   a first light modulator configured to modulate the first light;   a second light modulator configured to modulate the second light;   a light combiner configured to combine light emitted from the first light modulator and light emitted from the second light modulator with each other;   a projection optical system configured to project light emitted from the light combiner;   a second light source device configured to emit invisible light; and   an optical part configured to combine the first light emitted from the light separator and the invisible light emitted from the second light source device with each other, wherein   the invisible light emitted from the second light source device includes first polarized light with a first polarization direction and second polarized light with a second polarization direction different from the first polarization direction,   the first light and the invisible light which are emitted from the optical part enter the first light modulator, and   the projection optical system projects light including the first light, the second light, and the invisible light.   
     
     
         2 . The projector according to  claim 1 , further comprising:
 a first polarizer which is disposed between the light separator and the first light modulator, and which the first light emitted from the light separator enters; and   a second polarizer which is disposed between the first light modulator and the light combiner, and which the first light and the invisible light which are emitted from the first light modulator enter, wherein   the first polarizer emits the first light with the first polarization direction,   the first light modulator emits light including the second polarized light out of the invisible light and at least one of the first light with the first polarization direction and the first light with the second polarization direction, and   the second polarizer is configured to emit the second polarized light and the first light with the second polarization direction.   
     
     
         3 . The projector according to  claim 1 , wherein
 the second light source device includes
 a light emitter configured to emit the invisible light as unpolarized light, and 
 a birefringent part which the invisible light enters, and which is configured to emit the first polarized light and the second polarized light. 
   
     
     
         4 . The projector according to  claim 1 , wherein
 the second light source device includes
 a first laser source disposed along a first direction perpendicular to an optical axis of the second light source device, and configured to emit the first polarized light with the first polarization direction, and 
 a second laser source disposed along a second direction perpendicular to both of the optical axis of the second light source device and the first direction, and configured to emit the second polarized light with the second polarization direction. 
   
     
     
         5 . The projector according to  claim 1 , wherein
 the second light source device includes
 a first laser source disposed along a first direction perpendicular to an optical axis of the second light source device, and configured to emit the first polarized light with the first polarization direction, 
 a second laser source disposed along a second direction perpendicular to both of the optical axis of the second light source device and the first direction, and configured to emit the second polarized light with the second polarization direction, 
 a third laser source disposed along the first direction and disposed at a position symmetric to the first laser source about the optical axis of the second light source device, and configured to emit the first polarized light with the first polarization direction, and 
 a fourth laser source disposed along the second direction and disposed at a position symmetric to the second laser source about the optical axis of the second light source device, and configured to emit the second polarized light with the second polarization direction. 
   
     
     
         6 . The projector according to  claim 1 , wherein
 the second light source device includes
 a first laser source configured to emit the first polarized light as first circularly-polarized light with a first rotational direction, and 
 a second laser source configured to emit the second polarized light as second circularly-polarized light with a second rotational direction opposite to the first rotational direction. 
   
     
     
         7 . The projector according to  claim 1 , wherein
 the optical part is configured to reflect the first light and transmit the invisible light, and   the second light source device is disposed at an opposite side to the first light modulator with respect to the optical part.   
     
     
         8 . The projector according to  claim 2 , wherein
 the first light is red light,   the invisible light is infrared light, and   the optical part is configured to combine the red light and the infrared light with each other to emit the red light and the infrared light combined with each other.   
     
     
         9 . The projector according to  claim 2 , wherein
 the first light is blue light,   the invisible light is ultraviolet light, and   the optical part is configured to combine the blue light and the ultraviolet light with each other to emit the blue light and the ultraviolet light combined with each other.   
     
     
         10 . The projector according to  claim 4 , wherein
 the second light source device further includes a diffractor disposed at a light exit side of the first laser source and the second laser source and configured to diffract the invisible light, and   the invisible light projected by the projection optical system includes a predetermined pattern.   
     
     
         11 . The projector according to  claim 1 , further comprising:
 a light transmissive member disposed at one of a light incident side and a light exit side of the first light modulator, wherein   the light transmissive member includes a shield part configured to reflect the invisible light and transmit the first light, and a transmission part configured to transmit both of the invisible light and the first light, and   the invisible light projected by the projection optical system includes a predetermined pattern.   
     
     
         12 . The projector according to  claim 1 , further comprising:
 an imager configured to take a projection image including the invisible light and the first light which are projected by the projection optical system;   a movement mechanism configured to move the projection optical system to change a position of the projection image; and   a controller configured to control the movement mechanism in accordance with an imaging result taken by the imager.   
     
     
         13 . The projector according to  claim 1 , further comprising:
 an imager configured to take a projection image including the invisible light and the first light which are projected by the projection optical system; and   a controller configured to change an area where an image is formed in an image forming area of the first light modulator in accordance with an imaging result taken by the imager.